// class 关键词

// function Person (name) {
//     this.name = name
// }

// Person.prototype.say =  function() {
//     console.log(`hi my name is ${this.name}`)
// }

class Person {
    constructor(name) {
        this.name = name
    }

    say() {
        console.log(`hi my name is ${this.name}`)
    }
}

const p = new Person('tom')
p.say()